/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.attribute;

import proguard.classfile.*;
import proguard.classfile.visitor.ClassVisitor;

/**
 * Representation of an Local Variable table entry.
 *
 * @author Eric Lafortune
 */
public class LocalVariableTypeInfo implements VisitorAccepter, Comparable {
    public int u2startPC;
    public int u2length;
    public int u2nameIndex;
    public int u2signatureIndex;
    public int u2index;

    /**
     * An extra field pointing to the Clazz objects referenced in the type string. This field is typically filled out by
     * the <code>{@link
     * proguard.classfile.util.ClassReferenceInitializer
     * ClassReferenceInitializer}</code>. References to primitive types are ignored.
     */
    public Clazz[] referencedClasses;

    /**
     * An extra field in which visitors can store information.
     */
    public Object visitorInfo;

    /**
     * Creates an uninitialized LocalVariableTypeInfo.
     */
    public LocalVariableTypeInfo() {}

    /**
     * Creates an initialized LocalVariableTypeInfo.
     */
    public LocalVariableTypeInfo(int u2startPC, int u2length, int u2nameIndex, int u2signatureIndex, int u2index) {
        this.u2startPC = u2startPC;
        this.u2length = u2length;
        this.u2nameIndex = u2nameIndex;
        this.u2signatureIndex = u2signatureIndex;
        this.u2index = u2index;
    }

    /**
     * Returns the name.
     */
    public String getName(Clazz clazz) {
        return clazz.getString(u2nameIndex);
    }

    /**
     * Returns the signature.
     */
    public String getSignature(Clazz clazz) {
        return clazz.getString(u2signatureIndex);
    }

    /**
     * Applies the given visitor to all referenced classes.
     */
    public void referencedClassesAccept(ClassVisitor classVisitor) {
        if (referencedClasses != null) {
            for (int index = 0; index < referencedClasses.length; index++) {
                Clazz referencedClass = referencedClasses[index];
                if (referencedClass != null) {
                    referencedClass.accept(classVisitor);
                }
            }
        }
    }

    // Implementations for VisitorAccepter.

    public Object getVisitorInfo() {
        return visitorInfo;
    }

    public void setVisitorInfo(Object visitorInfo) {
        this.visitorInfo = visitorInfo;
    }

    // Implementations for Comparable.

    public int compareTo(Object object) {
        LocalVariableTypeInfo other = (LocalVariableTypeInfo)object;

        return this.u2startPC < other.u2startPC ? -1
            : this.u2startPC > other.u2startPC ? 1 : this.u2length < other.u2length ? -1
                : this.u2length > other.u2length ? 1 : this.u2index < other.u2index ? -1
                    : this.u2index > other.u2index ? 1 : this.u2signatureIndex < other.u2signatureIndex ? -1
                        : this.u2signatureIndex > other.u2signatureIndex ? 1
                            : this.u2nameIndex < other.u2nameIndex ? -1 : this.u2nameIndex > other.u2nameIndex ? 1 : 0;
    }
}
